I like it.

UI looks more polished (maybe QT4 renders nicer on my Ubuntu GNOME based desktop… but it certainly looks more like the rest of my apps).

Possibly a bit faster?

64bit guests – WIN!

Shared Folders still cause the XP guest to panic if i try to do anything non-trivial (e.g. build, run cmake). I still use Samba on host to share with guest – which works okay, but isn’t super-happy-fun-time fast.

Seemless mode is a bit nicer, the Windows task bar sits above the GNOME task bar, making it a lot easier to interact. It’s not perfect yet, you can still get some real visual oddities, but it’s pretty sweet.

When just using normal, in window, it can cause X to use a bit much CPU, which goes away when the VirtualBox window is minimised – leading to faster compiles in guest.

Having a guest running (in this case Windows XP) does cause a lot more CPU wakeups – draining battery life.

I wish the snapshots showed how large they were, it’s currently kinda guesswork to work out how much disk space a snapshot is using.